Power mechanism



POWER MECHANI SM Filed jan. 16, 1926 El@ il 4Patented Oct. 12V. 1926.

lUNITI-".o STATES A `1,602,758 PATENT. orriclz.A

FARNUM F. DORSEY, OF BDCHSTER, NEVIYOBK, A'SSIGN'OB .TO N'OIBJJH` EAST .AP- v PLIANCES INC., F ROCHESTER,"NEW YORK, A CORPORATION OF NEW YORK.

roWER p MECHANISM.

Application mea January 1a, 192s. semina. 81,719.

This invention relates to power' mechanism suitable for use in connection with a typewriter, or other machine, in which a series of type-bars or thelike areI to be actu- `5 ated selectively,

In certain power mechanisms for the purpose in question, it has heretofore been proposed to Vuse a constantly rotary vpower-roller, driven by an electric motor or other suitable source-of power, and to connect vwith each type-bar, or other device which'is to be actuated, an actuating unit or assembly including means which may be thrown intov engagement with the lpower-roller to derive movement therefrom. The present invention relates to mechanism of the general character just described, and the novelty of the invention resides particularly in the' means which engage and are directlyactuatf ed by the roller.

In accordance with the present invention,

, the roller iscaused to move a movable member' or actuator mounted adjacent the roller,- by means of an interponent which is formed and adapted to roll freely between the surface of the power-roller and an opposed face or surface-on the actuator, this interponent being thrown into operative engagement with these parts by suitable selecl tive means', such as manually operable keys.

In the accompanying drawings, Fig. 1s a side-elevation, partly in section, showing power mechanism embodying the vpresent 1nvention, as applied Vto a typewriter. Fig. 2k

' is a detail from Fig. 1, butV on a larger scale, showing particularly the power mechanism with the parts in the position assumed at the-end of the operative movement; Fig. 3 is a rear-elevation of the parts shown in Fig.'2.

' The invention is illustrated asembodied in a typewriter having the usual type-bars 5, mounted on'a p ivot 6 and actuated by bellcrank levers 7 which are pivoted at 8. Each known manner, with a corresponding typebar, by means of a pin 9; and a spring 10, attached to the lever, tends to return it to the normal position shown in Fig. 1, with its upper arm resting against a stop-bar 11. The power-roller is shown as a hollow member, which vis made preferably of hardened steel, and is lon 'tudinally serrated on itsv outer surface. he actuators through which the several type-bars are moved have bell-crank lever is connected, in a well` the form-cfa seriesof bell-crank-levers 13, mounted on a pivot-rod 14 which is supported by a transverse member 15 on the frame fof the'machine. .The upper horizontal arm of each actuator 13 is connected,by a link 60 16, with'the corresponding lever 7 The interponent characteristic of the present invention is shown as having ythe-form of`a disc 17, 'which is preferably made of.

hardened4 steel, and is serrated at its eri h- 65 ery. This disc lies vloosely between t e, or- Ward ends of two parallel arms 18, which are interconnected and are pivoted to the actuator by\means of a transverse pin 19. The forward ends of the arms are slotted to receive trunnions 20, projecting axially from the disc 17. The disc is of lthe same thickness as the actuator YV13, and the latter has a working face 21, which is preferably serrated, and 1s opposed-to the power-roller. 7l At its lower end the actuator terminates in a hook-like-extremityv 22, which serves riormally as a seat to support the disc, and in this normal position of the parts the disc is out of engagement with the power-roller. The unit of the power mechanism just described is controlled by a key 23, forming part of the usual keyboard of the typewriter. This key moves a key-lever 24, which is pivoted at 25, the key being held normally in raised posit-ion by a spring 26. At its rear end the key-lever carries a trip- 27, of which the upper end lies normally beneath shoulders 28 on the arms 18,- as shown in Fig. 1. When the key is depressed the trip engages the shoulders and swings.. the arms upwardly, thereby bringing the interponent 17 into engagement with the power-roller. Since this roller turns in a clockwise direction, it at oncerolls the iiterponent -upwardly along the face 21, and f 4since this face is at an angle with the surface of the roller the result is to cause the actuator 13 to swing about its pivot 14 into which 'it has already acquired, `and in completin its lmovementl the 'type-bar acts, throng the intervening mechanism, to swing the actuator slightly beyond the posii tion shown in Fig. 2, thus releasing the interponent from pressure a'gainst the powerroller. The interponent is then immediately returned to its original position, thisreturn occurring before the actuator has time to swing back sufficiently to cause renewed engagement with the power-roller. This return4 of the vrinterponent is caused in art, when the apparatus is arranged as ilustrated, bythe action of gravity, butto render it more rapid and certain a spring 29 is also used, this spring havin the form of a blade mounted on the rame-member 15. The lower end of the spring cooperateswith upwardly projecting lugs 3() on the arms 18. Normally these lugs are in a position in front of and out of engagement with the spring29, so that no resistance is opposed to the movement, by the controlling key, of the arms and the interponent but the rearward swinging movement of the actuator causes the lugs to engage the spring, so that the spring acts to swing the arms downwardly as soon as the interponent is released from itsrolling engagement` with the power-roller,

The complete cycle of movement of the interponent and the actuator takes place so rapidly that the key is usually still in depressed position until afterV the mechanism has returned to normal position.- In order that this may not cause interference with the return of the mechanism, the Vtrip 27 is mounted on a pivot 31 o n the key-lever and is held in its normal position by a spring 32 with the lower end of the trip resting against a stop-lug 33. Upon the return of the actuator and thel arms 18 to normal position, the upper end 'of the trip rests against` the forward surfaces of the shoulders 28, and is by them swung :Eorwardly. Upon the subsequent' release' and light :secarse return of `the key-lever, however, vthe spring 327. swings the trip backl to its normal position shown in Fig. 1, ready for another operation.- y

It will be understood that as many of the power-units shown and described may bearranged side-by-side along the power-roller as maybe necessary -to actuate the several type-bars, or other parts of the machine,

by/ a key or other convenient means. The mechanismbf the present invention has the advantage, among others that theconnection between the power-rollery and the actuator 13 is the result of a purely rolling movement of the interponent, so that the power is -transmitted positivel and at the same time with a minimum oy friction and wear. For the same' reason, 'little or no lubrication .of the mechanism is necessary, and 'each unit, in spite lof its positive action, may be designed to occupy a narrow space, since it is not necessary to provide bearing surfaces'o any substantial width.

The invention claimed is Y l 1. Power mechanism, for a 'typewriter or vroller and having a cam surface opposed thereto, a peripherally serrated disc adapted to rol-l between said cam surface and said power roller, two arms pivoted to said lever and said disc, and keycontrolled -means for y swinging said arms to move the disc into operative engagement with the power-roller.

FARNUM F. DonsEY.

each such unit being controlled separately 

